Academic literature on the topic 'Modèle de fluide équivalent'
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Journal articles on the topic "Modèle de fluide équivalent":
Detemple, Jérôme B., and Richard E. Kihlstrom. "Acquisition d’information dans un modèle intertemporel en temps continu." L'Actualité économique 63, no. 2-3 (January 27, 2009): 118–37. http://dx.doi.org/10.7202/601413ar.
JEBBARI, Abdelilah, and Driss EL ZANATI. "L’anticipation de la défaillance des entreprises clientes des établissements bancaires marocains via la méthode de la régression logistique." International Journal of Economic Studies and Management (IJESM) 1, no. 1 (September 29, 2021): 73–85. http://dx.doi.org/10.52502/ijesm.v1i1.155.
Mathiot, Jean. "Évolution, sélection, information." Philosophiques 25, no. 2 (August 8, 2007): 203–18. http://dx.doi.org/10.7202/027487ar.
Dauphin, Anyck, Abdel-Rahmen El Lahga, Bernard Fortin, and Guy Lacroix. "Choix de consommation des ménages en présence de plusieurs décideurs." Articles 82, no. 1-2 (August 28, 2006): 87–118. http://dx.doi.org/10.7202/013466ar.
Bernard, Jean-Thomas, François Lessard, and Simon Thivierge. "La demande d’énergie du secteur commercial québécois." Articles 62, no. 1 (January 27, 2009): 5–22. http://dx.doi.org/10.7202/601357ar.
Quirion, Jean, and Judit Freixa. "L’exportation du modèle terminologique québécois en Catalogne." Meta 58, no. 3 (May 9, 2014): 643–61. http://dx.doi.org/10.7202/1025056ar.
Zongo, Bétéo, Abdoulaye Diarra, Bruno Barbier, Malicki Zorom, Harouna Karambiri, Souleymane Ouédraogo, Patrice Toé, Yacouba Hamma, and Thomas Dogot. "Évaluation ex ante de l’irrigation de complément dans un contexte sahélien : couplage d’un modèle biophysique à un modèle économique d’exploitation agricole." BASE, no. 3 (2019): 174–87. http://dx.doi.org/10.25518/1780-4507.18056.
Piment, Hélène. "Modèle communicationnel d’un réseau socionumérique d’entreprise." Revue Communication & professionnalisation, no. 3 (February 29, 2016): 100–123. http://dx.doi.org/10.14428/rcompro.vi3.473.
Poirier, Laetitia, Éric Ghigo, David Daudé, and Éric Chabrière. "Modèles alternatifs (6)." médecine/sciences 35, no. 6-7 (June 2019): 544–48. http://dx.doi.org/10.1051/medsci/2019110.
Tatilon, Claude. "Pédagogie du traduire : les tâches cognitives de l’acte traductif." Meta 52, no. 1 (March 12, 2007): 164–71. http://dx.doi.org/10.7202/014731ar.
Dissertations / Theses on the topic "Modèle de fluide équivalent":
Jamois, Alexis. "Modélisation et réalisation d'absorbants acoustiques par impression 3D : étude en incidence normale et application au traitement d'un conduit." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0010.
Conventional rigid porous materials such as wools or foams do not provide effective absorption at low frequencies in complex industrial environments. For these applications, the structures developed are generally quarter-wave resonators or Helmholtz resonators. In recent years, 3D printing techniques have made it possible to produce resonator geometries that were previously difficult to produce. The ease of use and affordability of these techniques means that it is now possible to create tailor-made absorbing devices to meet specific requirements very quickly. This long-term objective requires, on the one hand, validation of the reliability of the dimensions obtained during the production of absorbent structures and, on the other hand, the ability to effectively model a variety of geometries in different contexts. In this thesis, stereolithography was chosen to print the samples based on literature results. Studies have concluded that it is more accurate for acoustic devices than other techniques. The geometry chosen for this study consists in a stack of volumes (spherical or cubic), connected in the three directions of space by channels in the image of cubic crystals. A large number of samples were manufactured varying the production parameters in order to measure the variability of the characteristic dimensions of the samples. Among the various modelling approaches presented, the numerical tests carried out led to the choice of equivalent fluid modelling based on the identification of JCAPL parameters. They are identified in a representative volume homogenised throughout the sample. This homogenisation of behaviour is suited to the geometries studied because of their periodic nature. The reaction of the geometries we are considering makes impedance modelling impossible. The samples are first studied at normal incidence, in order to link the variability of realisation to the measured acoustic behaviour. The measurement results and the predictions are in good agreement. Some samples were made specifically for duct wall measurement, in order to validate the use of the equivalent fluid approach. These tests were also used to confirm the conclusions drawn for normal incidence. The variability of the geometry has a real impact on the acoustic behaviour, but the main problem with rigid 3D printed samples is their adaptation to the measurement benches
Auquier, Nicolas. "Modèle équivalent de structures multicouches à interfaces complexes." Electronic Thesis or Diss., Vaulx-en-Velin, École nationale des travaux publics de l’État, 2023. http://www.theses.fr/2023ENTP0008.
This research deals with the development of a pre-existing equivalent model by including the modeling of imperfect interfaces. The aim is to improve the accuracy of the modeling in current equivalent models, which generally assume perfect continuity of the stress and displacement fields. The coupling conditions at the interfaces of the multilayer equivalent model are therefore modified. They are modeled using a complex stiffness. A high stiffness corresponds to good coupling; conversely, a low stiffness corresponds to poor coupling. This is described by a single parameter, the interface parameter, which is the inverse of the interface stiffness. This parameter is dependent on each layer, but can also be used as a global value for the apparent imperfection of the entire structure. The methodology for characterizing a planar structure, and in particular a beam, is detailed in the third chapter of this thesis manuscript. The main post-processing elements employed are presented in detail, and have enabled the characterization method to be extended up to 100 kHz. Finally, modeling and experimental methodology are employed in a complementary manner. The aim is to characterize the dynamics of samples with imperfect interfaces. The effect of imperfect interfaces is visualized not only as a function of frequency, but also as a function of space. A complementary approach between these two visualizations is finally carried out to provide more detailed characterization results
He, Ji. "Modèle numérique équivalent pour les propriétés hydro-mécaniques des roches fracturées." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10038/document.
This thesis concerns the use of the "Numerical Test System" for the determination of the equivalent hydraulic and mechanical properties of fractured rock masses. The thesis is composed of 7 chapters. The first chapter describes the objective of the thesis and briefly presents the previous studies conducted on fractured rock masses, with a particular focus on the Composite Element Method as weil as the estimation of the equivalent hydraulic and mechanical properties of fractured rocks. The second chapter presents the tools used in the thesis development, namely the finite element method, the composite element method, the coupling theory, the artificial neural network and the Monte Carlo Method. The third chapter presents the concept of the "Numerical Test System (NTS)" for determination of the equivalent hydraulic properties offractured rock. This method requires field data on dominating fractures. Chapters 4 and 5 present the determination of the equivalent hydraulic and mechanical properties and the relevant REYs neglecting the seepage/stress coupling. The 6th chapter presents the determination of the equivalent hydraulic properties considering seepage/stress coupling. This Chapter also establishes a stress/permeability database for describing the relationship between stresses and the equivalent hydraulic property. The last chapter describes a procedure based on a combination of the implicit and explicit approaches for the analysis of a grravity dam. The eqivalent properties of the implicit method are determined using the NTS
Chiambaretto, Pierre-Louis. "Modèle vibratoire de réservoir cryotechnique de lanceur : définition d’un méta-matériau équivalent." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0022/document.
Liquid hydrogen is a propellant alternatively used with liquid oxygen for the propulsion of many launchers, especially those of the Ariane family. However, its dangerousness prohibits vibration tests on filled tank. The aim of this PHD is to explore the possibility to carry out such vibration tests by filling these tanks with a substitute material : a set of pre-stressed balls. As further argued and developed in the report, the objective is to obtain a modal behavior similar in term of mode shapes and natural frequencies to those of the tank filled with liquid hydrogen for the first modes. In the first part, an analytical approach based on a method using frequency equivalences is detailed. After presenting the outlines of the methodology used and all the models developed, the methodology is applied to the experimentally studied case in order to highlight the influence of the different parameters as well as then to propose a first method to choose a set of well adapted balls. The second part deals mainly with experimental and numerical aspects. Firstly, the balls used in the thesis are characterized. Then, the experimental set-up designed and realized to carry out vibration tests on a tank filled with pre-stressed balls is presented. The different results obtained are compared with both analytical results and numerical based on discrete-elements and finite-elements results
Nguyen, Thuong Anh. "Analyse systématique du concept de comportement linéaire équivalent en ingénierie sismique." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1032/document.
In earthquake engineering, it is common that the behaviour of a structure undergoing a strong motion is characterized by wise or narrow hysteresis loops depending on the type of behaviour of the structure. Considering this non-linear behaviour in a transient calculation requires a huge need of resources in terms of calculation time and memory. In this context, the method of equivalent linearization, consisting in the evaluation of the non-linear response of the structure has been introduced by geotechnical engineers In the 1970s. Despite efforts of many authors, this method is still not used in structural field. The goal of this research is to examine the linear equivalent behaviour in the context of the simplified method of evaluating the non-linear response of a structure in earthquake engineering. We review the criteria of equivalence adopted by many methods searching for the equivalence of (1) the maximum of displacement or (2) quantity of dissipated energy or (3) the restore force. Our argumentative analyses carry out that these three criteria are not pertinent and/or efficient. This leads, in some cases, to some unexplained results. We show the important role, which is mostly neglected in existing method, of frequency content while evaluating the ductile demand. Based on this recognition, we introduce a new method of equivalent linearization based on the transfer function. We use this method in order to explore a numerical experimental plan in which we calculate the equivalent characteristics (frequency and damping) versus the ductile demand for different configuration characterized by (a) the ratio between the frequency of the oscillator and the central frequency of the input signal, (b) the hardening and (c) the behaviour which covers the elastoplastic and damaged ones. We propose two new approaches of the linear equivalent behaviour. The first one, aiming to improve the non-linear static procedure of ATC40, use the secant stiffness and the maximal displacement. This approach consists in an estimation of damping which is different to ATC40. Its pertinence is established by evaluating with accuracy the maximal displacement of the canonical non-linear systems. The second approach consists in restitution of the dynamic of the response of a non-linear oscillator by using the transfer function. The pertinence of this proposition is shown through the criteria of Anderson, especially in terms of transferred motion. In this effect, the linear equivalent behaviour based on the transfer function allows to cope the transferred motion through the non-linear oscillator without performing the non-linear transient calculation. The validation of the linear equivalent behaviour based on the transfer function has been examined on real structures through some experimental tests such as the reinforced concrete wall (SAFE) or piping systems (BARC and EPRI)
Lope, Alonso Luis Francisco de. "Développement d'un modèle tridimensionnel couplant sur les approches "milieu poreux équivalent" et "réseau des fractures discrètes" pour la modélisation de l'écoulement dans les massifs fissurés." Paris, ENMP, 1993. http://www.theses.fr/1993ENMP0714.
Broussely, Marc. "Réduction de modèles thermiques par la théorie des réseaux, application à la surveillance d'une machine asynchrone par couplage d'un modèle thermique réduit avec un schéma équivalent électrique." Poitiers, 2000. http://www.theses.fr/2000POIT2320.
Vachon, François. "Estimation de l'équivalent en eau de la neige en milieu subarctique du Québec par télédétection micro-ondes passives." Thèse, Université de Sherbrooke, 2009. http://savoirs.usherbrooke.ca/handle/11143/2806.
Pitilakis, Dimitris. "Soil-structure interaction modeling using equivalent linear soil behavior in the substructure method." Châtenay-Malabry, Ecole centrale de Paris, 2006. http://www.theses.fr/2006ECAP1067.
A numerical procedure, coded into a numerical code (MISS3D-EqL), is developed to accommodate for the effects of the nonlinear soil behavior on the soil-structure interaction (SSI) using an equivalent linear approach. Equivalent linear behavior is assumed for the soil, while the response of the structure to the ground shaking and its effects on the soil are properly taken into account using the substructure method. The proposed procedure is validated against other numerical software and experimental means, such as shaking table and centrifuge tests. The effects of the equivalent linear soil behavior on the soil-structure system response are clearly demonstrated by analyses of representative case studies. A recursive analysis of typical soil profiles and infrastructures is performed to reveal the further softening of the system and the increased energy dissipation, compared to the linear case, due to the equivalent linear soil behavior. Special emphasis is given to the estimation of the foundation dynamic impedance functions. Dynamic stiffness and radiation dashpot coefficients are estimated for typical footings resting on typical soil profiles with equivalent linear behavior. The effects of the nonlinear soil behavior on the dynamic coefficient are shown compared to the linear elastic case. The dynamic stiffness coefficient decreases with increasing input acceleration amplitude, with decreasing soil shear wave velocity and with decreasing soil shear modulus, while it depends on the frequency content of the earthquake. The radiation dashpot coefficient is unaffected by the nonlinear soil behavior for most practical applications
Pinot, Christophe. "Modélisation des diodes électroluminescentes organiques multicouches dopées. Application à de nouvelles architectures." Phd thesis, Ecole Polytechnique X, 2008. http://pastel.archives-ouvertes.fr/pastel-00005744.